WoS İndeksli Yayınlar Koleksiyonu / WoS Indexed Publications Collection

Permanent URI for this collectionhttps://hdl.handle.net/11147/7150

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2010 - 20112

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Author: search.filters.author.Selbuz, Levent

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  • Article
    Citation - WoS: 13
    Scalar Neutrinos at the Lhc
    (American Physical Society, 2011) Demir, Durmuş Ali; Demir, Durmuş Ali; Frank, Mariana; Selbuz, Levent; Turan, Ismail; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    We study a softly broken supersymmetric model whose gauge symmetry is that of the standard model gauge group times an extra Abelian symmetry U(1)'. We call this gauge-extended model the U(1)' model, and we study a U(1)' model with a secluded sector such that neutrinos acquire Dirac masses via higher-dimensional terms allowed by the U(1)' invariance. In this model the mu term of the minimal supersymmetric model (MSSM) is dynamically induced by the vacuum expectation value of a singlet scalar. In addition, the model contains exotic particles necessary for anomaly cancellation, and extra singlet bosons for achieving correct Z'/Z mass hierarchy. The neutrinos are charged under U(1)', and thus, their production and decay channels differ from those in the MSSM in strength and topology. We implement the model into standard packages and perform a detailed analysis of sneutrino production and decay at the Large Hadron Collider, for various mass scenarios, concentrating on three types of signals: (1) 0l + MET, (2) 2l + MET, and (3) 4l + MET. We compare the results with those of the MSSM whenever possible, and analyze the standard model background for each signal. The sneutrino production and decays provide clear signatures enabling distinction of the U(1)' model from the MSSM at the LHC.
  • Article
    Citation - WoS: 24
    Citation - Scopus: 25
    Sneutrino Dark Matter: Symmetry Protection and Cosmic Ray Anomalies
    (American Physical Society, 2010) Demir, Durmuş Ali; Demir, Durmuş Ali; Frank, Mariana; Selbuz, Levent; Turan, İsmail; 04.05. Department of Pyhsics; 04. Faculty of Science; 01. Izmir Institute of Technology
    We present an R-parity conserving model of sneutrino dark matter within a Higgsphilic U(1)′ extension of the minimal supersymmetric standard model. In this theory, the μ parameter and light Dirac neutrino masses are generated naturally upon the breaking of the U(1)′ gauge symmetry. One of the right-handed sneutrinos is the lightest supersymmetric particle. The leptonic and hadronic decays of another sneutrino, taken to be the next-to-lightest superpartner, allow for a natural fit to the recent results reported by the PAMELA experiment. We perform a detailed calculation of the dark matter relic density in this scenario, and show that the model is consistent with the ATIC and Fermi LAT experiments. © 2010 The American Physical Society.